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An miRNA that remains constant in its expression through these stages is proposed to have a role in regulating general aspects of cell physiology. [8] Thus it was becoming evident in 2003 shortly after its discovery, that the mir-92 miRNA and associated family members are providing functional roles to the cell cycle and to cell signalling, and ...
miRNA biogenesis in plants differs from animal biogenesis mainly in the steps of nuclear processing and export. Instead of being cleaved by two different enzymes, once inside and once outside the nucleus, both cleavages of the plant miRNA are performed by a Dicer homolog, called Dicer-like1 (DL1). DL1 is expressed only in the nucleus of plant ...
These two proteins homeostatically control miRNA biogenesis by an auto-feedback loop. [16] A 2nt 3' overhang is generated by Drosha in the nucleus recognized by Dicer in the cytoplasm, which couples the upstream and downstream processing events. Pre-miRNA is then further processed by the RNase Dicer into mature miRNAs in the cell cytoplasm.
StarBase; Content; Description: microRNA-mRNA interaction maps from Argonaute CLIP-Seq and Degradome-Seq data.: Contact; Research center: Sun Yat-sen University: Laboratory: Key Laboratory of Gene Engineering of the Ministry of Education
[3] [4] Mirtrons arise from the spliced-out introns and are known to function in gene expression. Mirtrons were first identified in Drosophila melanogaster and Caenorhabditis elegans . [ 5 ] [ 6 ] The number of mirtrons identified to date are 14, 9, and 19 in D. melanogaster, C. elegans and mammals respectively. [ 7 ]
A miRNA can be derived from each arm of the pre-miRNA hairpin. Historically, the least common of these two miRNA products was denoted by the addition of * to the miRNA name, however the modern convention is to denote mature miRNA products as 5p or 3p. [11] Both mir-10 and mir-10* have been detected in Drosophila.
Each member of miR-125 family has two different variants of mature miRNAs - 5p and 3p. Both variants originate from the same pre-miRNA. MiR-125-5p variant generally shows higher expression compared to miR-125-3p. [6] In humans, miR-125 family is composed of three homologs: hsa-miR-125a, hsa-miR-125b-1 and hsa-miR-125b-2. [7]
The miR-15 microRNA precursor family is made up of small non-coding RNA genes that regulate gene expression. The family includes the related mir-15a and mir-15b sequences, as well as miR-16-1, miR-16-2, miR-195 and miR-497.
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